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Loans, Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
With no related allowance recorded [Abstract] |  |
Recorded Investment | $ 10,014 | $ 9,978
Unpaid Principal Balance | 10,602 | 10,373
Average Recorded Investment | 10,110 | 10,705
Interest Income Recognized | 92 | 400
With an allowance recorded [Abstract] |  |
Recorded Investment | 5,474 | 5,180
Unpaid Principal Balance | 5,696 | 6,035
Related Allowance | 885 | 904
Average Recorded Investment | 5,521 | 5,850
Interest Income Recognized | 35 | 173
Total [Abstract] |  |
Recorded Investment | 15,488 | 15,158
Unpaid Principal Balance | 16,298 | 16,408
Related Allowance | 885 | 904
Average Recorded Investment | 15,631 | 16,555
Interest Income Recognized | 127 | 573
Commercial and Industrial [Member] |  |
With no related allowance recorded [Abstract] |  |
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Average Recorded Investment | 0 | 975
Interest Income Recognized | 0 | 43
With an allowance recorded [Abstract] |  |
Recorded Investment | 181 | 264
Unpaid Principal Balance | 249 | 822
Related Allowance | 71 | 159
Average Recorded Investment | 202 | 374
Interest Income Recognized | 0 | 0
Total [Abstract] |  |
Recorded Investment | 181 | 264
Unpaid Principal Balance | 249 | 822
Related Allowance | 71 | 159
Average Recorded Investment | 202 | 1,349
Interest Income Recognized | 0 | 43
Commercial Secured By Real Estate [Member] |  |
With no related allowance recorded [Abstract] |  |
Recorded Investment | 9,480 | 9,541
Unpaid Principal Balance | 9,875 | 9,936
Average Recorded Investment | 9,516 | 9,310
Interest Income Recognized | 89 | 350
With an allowance recorded [Abstract] |  |
Recorded Investment | 4,526 | 4,258
Unpaid Principal Balance | 4,654 | 4,360
Related Allowance | 657 | 660
Average Recorded Investment | 4,548 | 4,765
Interest Income Recognized | 32 | 171
Total [Abstract] |  |
Recorded Investment | 14,006 | 13,799
Unpaid Principal Balance | 14,529 | 14,296
Related Allowance | 657 | 660
Average Recorded Investment | 14,064 | 14,075
Interest Income Recognized | 121 | 521
Residential Real Estate [Member] |  |
With no related allowance recorded [Abstract] |  |
Recorded Investment | 534 | 417
Unpaid Principal Balance | 727 | 417
Average Recorded Investment | 591 | 397
Interest Income Recognized | 3 | 5
With an allowance recorded [Abstract] |  |
Recorded Investment | 760 | 658
Unpaid Principal Balance | 786 | 853
Related Allowance | 157 | 85
Average Recorded Investment | 764 | 707
Interest Income Recognized | 3 | 2
Total [Abstract] |  |
Recorded Investment | 1,294 | 1,075
Unpaid Principal Balance | 1,513 | 1,270
Related Allowance | 157 | 85
Average Recorded Investment | 1,355 | 1,104
Interest Income Recognized | 6 | 7
Consumer [Member] |  |
With no related allowance recorded [Abstract] |  |
Recorded Investment | 0 | 20
Unpaid Principal Balance | 0 | 20
Average Recorded Investment | 3 | 23
Interest Income Recognized | 0 | 2
With an allowance recorded [Abstract] |  |
Recorded Investment | 7 | 0
Unpaid Principal Balance | 7 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 7 | 4
Interest Income Recognized | 0 | 0
Total [Abstract] |  |
Recorded Investment | 7 | 20
Unpaid Principal Balance | 7 | 20
Related Allowance | 0 | 0
Average Recorded Investment | 10 | 27
Interest Income Recognized | $ 0 | $ 2

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